<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 头部警告区 -->
      <el-alert title="注意:只允许为第三级分类设置相关参数！" type="warning" :closable="false" show-icon></el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="catelist"
            :props="cateProps"
            @change="handleChange"
            clearable
            >
          </el-cascader>
        </el-col>
      </el-row>

      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 动态参数面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 动态-添加参数按钮 -->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
          <!-- 动态-参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">
                  {{item}}
                </el-tag>
                <!-- 添加区域 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button v-else class="button-new-tag" size="small" 
                @click="showInput(scope.row)">
                  + New Tag
                </el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>

        <!-- 静态属性面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 静态-添加属性按钮 -->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
          <el-table :data="onlyTableData" border stripe>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">
                  {{item}}
                </el-tag>
                <!-- 添加区域 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button v-else class="button-new-tag" size="small" 
                @click="showInput(scope.row)">
                  + New Tag
                </el-button>
              </template>
            </el-table-column>
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close ="addDialogClosed"
      >
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close ="editDialogClosed"
      >
      <el-form :model="editForm" :rules="addFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类列表
      catelist:[],
      // 级联选择框的配置对象
      cateProps:{
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children:'children'
      },
      // 级联选择框双向绑定到的数组
      selectedCateKeys:[],
      // 被激活页签的名称
      activeName:'many',
      // 动态参数的数据
      manyTableData:[],
      // 静态属性的数据
      onlyTableData:[],
      // 添加属性按钮的显示与隐藏
      addDialogVisible:false,
      // 添加表单数据
      addForm:{
        attr_name:''
      },
      // 添加表单的验证规则对象
      addFormRules:{
        attr_name:[
          { required: true, message: '请输入参数名称', trigger: 'blur' },
        ]
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible:false,
      // 修改表单数据
      editForm:{
        attr_name:''
      },
      // 控制按钮与文本框的切换显示
      inputVisible:false,
      // 文本框输入内容
      inputValue:''
    }
  },
  methods: {
    // 获取所有商品的分类
    async getCateList(){
      const {data:res} = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败！')
      }
      this.catelist = res.data
    },
    // 级联选择框选中项变化会触发这个函数
    async handleChange(){
      this.getParamsData()
    },
    // 获取参数的列表数据 添加按钮----封装
    async getParamsData(){
      // 选中的不是三级分类
      if (this.selectedCateKeys.length !==3) {
        this.$message.error('请选择三级分类！！')
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      
      // 根据所选分类的Id,和当前所处的面板，获取对应的参数
      const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}})

      if (res.meta.status!==200) {
        return this.$message.error('获取参数列表失败')
      }

      // 将  参数1 参数2 参数3 参数4  字符串数据转换为 数组
      // [0: "参数1"  1: "参数2" ]
      // 按空格 截取
      res.data.forEach(item=>{
        if (item.attr_vals == []) {
          item.attr_vals = []
        }else{
          item.attr_vals = item.attr_vals.split(' ')
        }
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框输入的值
        item.inputValue = ""
      })

      // console.log(res.data);

      if (this.activeName === 'many') {
        this.manyTableData = res.data
      }else{
        this.onlyTableData = res.data
      }
    },
    // 页签 点击事件处理函数
    handleTabClick(){
      // console.log(this.activeName)
      this.getParamsData()
    },
    // 监听添加对话框的关闭事件
    addDialogClosed(){
      this.$refs.addFormRef.resetFields()
    },
    //点击按钮添加 
    addParams(){
      this.$refs.addFormRef.validate(async valid =>{
        if (!valid) {
          return
        }else{
          const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
            attr_name:this.addForm.attr_name,
            attr_sel:this.activeName
          })

          if (res.meta.status!==201) {
            return this.$message.error('添加参数失败')
          }
          this.$message.success('添加参数成功')
          this.addDialogVisible = false
          this.getParamsData()
        }
      })
    },
    // 点击按钮展示修改对话框
    async showEditDialog(id){
      const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${id}`,{
        params:{attr_sel:this.activeName}
      })

      // console.log(res);
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败！')
      }
      this.editForm = res.data
      this.editDialogVisible = true
      // console.log(this.editForm);
    },
    // 监听修改对话框关闭
    editDialogClosed(){
      this.$refs.editFormRef.resetFields()
    },
    // 修改对话框提交
    editParams(){
      this.$refs.editFormRef.validate(async valid=>{
        if (!valid) {
          return
        }else{
          const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
            attr_name:this.editForm.attr_name,
            attr_sel:this.activeName
          })

          if (res.meta.status !== 200) {
            return this.$message.error('修改参数失败！')
          }
          this.$message.success('修改参数成功！')
          this.getParamsData()
          this.editDialogVisible = false
        }
      })
    },
    // 根据id删除对应参数项
    async removeParams(attr_id){
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err=>err)

      if (confirmResult !=='confirm') {
        return this.$message.info('已取消删除!')
      }else{
        // 删除业务逻辑
        const {data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
        if (res.meta.status !== 200) {
          return this.$message.error('删除参数失败')
        }
        this.$message.success('删除参数成功！')
        this.getParamsData()

      }
    },
    // 文本框输入焦点或者按下回车键触发
    async handleInputConfirm(row){
      if (row.inputValue.trim().length ===0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }else{
        // 输入内容合法 可以提交
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue = ''
        row.inputVisible = false

        // 提交数据库
        this.saveAttrVals(row)
      }
    },
    // 将 attr_vals 的操作保存到数据库  --封装
    async saveAttrVals(row){
      const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
          attr_name:row.attr_name,
          attr_sel:row.attr_sel,
          attr_vals:row.attr_vals.join(' ')
        })

        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败')
        }
        this.$message.success('修改参数成功！')
    },
    // 点击按钮展示文本输入框
    showInput(row){
      row.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick 方法的作用,就是当页面上元素重新渲染之后，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    // 可选项X删除按钮  
    handleClose(i,row){
      row.attr_vals.splice(i,1)
      this.saveAttrVals(row)
    }
  },
  computed: {
    // 如果按钮需要被禁用,返回true,否则返回false
    isBtnDisabled(){
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类的Id
    cateId(){
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算添加对话框标题文本
    titleText(){
      if (this.activeName === 'many') {
        return '动态参数'
      }else{
        return '静态属性'
      }
    }
  },
  created() {
    this.getCateList()
  },
}
</script>

<style lang="less" scoped>
.cat_opt{
  margin: 15px 1px;
}
.el-tag{
  margin-left: 10px;
}
.input-new-tag{
  margin-left: 10px;
  width: 90px;
}
.button-new-tag{
  margin-left: 10px;
}
</style>

